Insulator.



No. 7|2,44o'. Patemd oct. 28,1-|9o2.-

.|. L. SHREFFLER.

INSULATOR. (Application ma Apr. 2, 1992.)

UNITED STATES PATENT OFFICE.

JAMES L. SHREFFLER, OF LEWISTOVN, PENNSYLVANIA.

INSULATOR.

SPECIFICATION formng part of Letters Patent No. 712,440, dated October 28, 1902.

Application filed April 2, 1902. Serial No. 101,038. (No model.)|

T0 all whom it may concern:

Be it known that I, JAMEs L. SHREFFLER, a citizen of the United States, residing at Lewistown, county of Miffiin, and State of Pennsylvania, have invented a certain new and useful Improvement in Insulators, of which the following is a specification.

My invention relates to a new and useful improvement in insulators, and has for its object to provide an insulator which is adapted to support and insulate wires, and is so constructed that the Wire may be easily attached or detached from said insulator without the' use of tie-wires, such as now used; and a further object is to so construct the insulator that it may be attached to the crossarm securely and yet not materially weaken the cross-arm where it is so secured.

Vith these ends in view this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims.

In order that those skilled in the art to which this invention'appertains may understand how to make and use the same, the construction and operation will now be described in detail, referring to the accompanying drawings, forming a part of this specification, in which- Figurel is a Vertical section through my improved insulator and a portion of the crossarm. Fig. 2 is a front view of the insulator.

In the drawings, A represents an outside casing of copper or iron, according to whether a copper or iron Wire is used. This casing or shield A is provided with a notch or slot B, in which the Wire is adapted to rest.

C is a screw-threaded bolt or rod threaded through the casing A, one end projecting through into the slot or notch B and having swiveled thereon the contact or gripping plate D. The other e'id of the bolt O is provided with a thumb-nut E. Thus if the wire is inserted within the notch or slot B the bolt Cis turned by the thumb-nut E, which forces the concaved contact or gripping plate D into contact with the wire and binds the same between the contact-plate and the lowel` wall of the slot B, and thus' holds the Wire securely in place; but the same may be quickly detached by unscrewing the bolt C.

F is a glass cap or inverted cup which is inserted within the interior of the casing A and enibedded in cement or brimstone for` the purpose of holding the cap F and casing A together. l

G is a bolt which has formed upon its upper end the head H, and the lupper end of this bolt is inserted within the cap or inverted cup F and is embedded in cement or brimstone for Ithe purpose of securing the insulatorto the bolt, the head H preventing the withdrawal of the bolt from the insulator. The bolt G then passes through the cross-arni I. A'Washer or shield J being formed upon the bolt abuts against the upper surface of the cross-arm, and a nut K is threaded upon the lower end of the bolt below the cross-arm for` securing the insulator in place.

The advantage of my invention is that the electrical Wire may be quickly and easily detached from the insulator and while being held securely thereto is not subjected to any wear at that point, such as is now the case where tie-wires are used.

Another advantage of my invention is that the glass part of the insulator is not exposed, and therefore cannot be easily broken, and a further advantage of my invention over the insulators now in use is that on account of the comparatively small bolt passing through the cross-arm said cross-arm will not be weakened materially, as is the case with the present insulators, in which a large opening is made through the cross-arm for the purpose of securing the insulator thereto.

Of course 1 do not wish to be limited to the exact construction here shown, as slight modifications could be made Without departing from the spirit of my invention.

I'Iaving thus fully described my invention, what I claim as new and useful is- 1. In an insulator, a metallic exterior casing, a slot or recess formed in said casing, a screW-threaded rod threaded through the casing, a concaved plate swiveled to the lower end of saidscrew-threaded rod and located within the slot or recess, a th umb-nut secured to the upper end of the screw-threaded rod, an inverted-cup-shaped cap of non-conducting material embedded within the casing, a bolt, an eularged head formed upon the upper end of the bolt, said upper end of the bolt embedded Within the interior of the non-conduotng eap, as and for the purpose speoified.

2. In'an insulator, an exterior metallie casing, a slot or recess formed in the easing, a sereW-threaded rod threaded through the oasw ing, a eoneaved plate swiveled upon one 'end of the rod Within the slot or reeess, a thumbnut secured to the other end of the screwthreaded rod, a eavity formed upon the interior of the easing,` an inVerted-oup-shaped eap seoured upon the eavity of the easing by being embedded in cement or brimstone, a bolt, an enlarged head formed upon the upper end of the bolt, the upper end' of said bolt being seeured within the non-cond uoting eap by bew JAMES L. SHREFFLER.

Witnesses:

J. C. SERENA, ALBERT W. KING. 

